48 



Loc. I'rom Central India (Bhopal, Dane} southwards through 

 Belgaum and the K olhapur State ( Wray), into the Madras Pre- 

 sidency : Cuddapah (Popert\ Coonoor, Yercaud in the Shevarov 

 Hills (Henderson), Trichinopoly (Popert), and Tinnevelly (Barber). 

 There are also two specimens in the British Museum labelled 

 Ceylon. 



Immature examples of this species are difficult to distinguish 

 from those of the preceding. Moreover, the sexual characters of 

 the male seldom attain the development presented by the type. 

 Nevertheless, the chelae never approach the form characteristic of 

 the male of europcev.s. 



34. Isometrus assamensis, Gates, Jour. Bom. N. H. Soc. iii, p. 250, 



1888 ; Pocock, in Weber's Seise Niederl. O.-Ind. iii, p. 90, 1893. 



$ . Coloured almost as in /. europceus, but with the yellow ante- 

 ocular triangle practically obliterated and the tail much less 

 spotted, the 5th segment being a deep uniform brown all over 

 and the brown on the others restricted to the under surface and 

 to the posterior end of the lateral surface. Chelae and legs 

 less spotted than in /. maculatus ; patellae of legs with only two 

 black bands. Much smaller than /. europceus ; carapace more 

 deeply emarginate in front. Last sternum of abdomen with a 

 pair of keels only, the median pair obsolete. Tail about five 

 times as long as the carapace, granular and carinate as in 

 /. europceus, but the superior keels of the 2nd and 3rd segments 

 each ending in a distinct spiniform tubercle ; vesicle almost as in 

 I. europceus, but neither the spine nor the aculeus so long as in 

 that species. CTielce with brachium broader as compared with its 

 length and finger shorter than in I. europceus, the finger as long 

 as the carapace and about twice the length of the underhand. 

 Pectinal teeth 14-16 ( rf , $ ). 



c? . Tail about six times as long as carapace ; spiniform tubercles 

 on 2nd and 3rd segments larger than in $ ; vesicle more parallel- 

 sided than in /. europceus, the posterior (inferior) border of the 

 spine and vesicle in the same straight line, whereas in /. maculatus 

 the vesicle diverges at an obtuse angle. Chelcv practically re- 

 sembling those of the $ , and not strikingly modified as in 

 /. europceus and I. ihurstoni. 



Measurements in mm. $ . Total length 36, carapace 4, tail 22. 

 3 . Total length 35, carapace 3-2, tail 22. 



Loc. N.E. India : Dhubri in Assam (Smart). 



35. Isometrus thwaitesi, Pocock, Jour. Bom. N. H. Soc. xi, p. 114. 



1897 ; Kraep. Tien:, Scoi-p. etc. p. 67, 1899. 



Much resembling I. europceus in colour ; but the ocular tubercle 

 marked with a median yellow stripe, and the anterior black patch 

 gives off an obliquely longitudinal black stripe, which runs forwards 

 and inwards to meet its fellow of the opposite side in the middle 



